Prep the Matcha Soak
Whisk matcha powder, hot water, and sugar in a shallow dish until smooth. Taste and adjust sweetness if needed. This will give your ladyfingers that earthy green tea flavor.
Make the White Chocolate Cream
Whip heavy cream to soft peaks. In another bowl, combine mascarpone, melted white chocolate, powdered sugar, and vanilla. Gently fold whipped cream into the mascarpone mixture. Fold, don’t mix like a tornado!
Dip the Ladyfingers
Quickly dip each ladyfinger into the matcha mixture—1–2 seconds max, don’t soak them like a sponge. Lay them in a single layer at the bottom of your serving dish.
Layer the Cream
Spread half of the white chocolate cream over the ladyfingers. Smooth gently with a spatula.
Repeat Layers
Add another layer of dipped ladyfingers, then the remaining cream. Smooth the top and sprinkle lightly with matcha powder. Add white chocolate shavings if you’re feeling fancy.
Chill
Cover and chill for at least 4 hours, ideally overnight. This helps the layers set beautifully and lets the flavors meld.